clutch ISUZU TFS SERIES 1997 Owner's Guide

7C-16 CLUTCH
Important Operations - Removal
1. Transmission Assembly
Refer to “MANUAL TRANSMISSION” of section 7B and 7B1
for “REMOVAL AND INSTALLATION” procedure.
2. Clutch Pressure Plate Assembly (HEC Engine Series)
3. Driven Plate Assembly (HEC Engine Series)
(1) Use the clutch pilot aligner

1 to prevent the driven plate
assembly

2 from falling free.
Clutch Pilot Aligner : 5-8840-2634-0
(2) Loosen the clutch cover bolts in the numerical order shown
in the illustration.
(3) Remove the pressure plate assembly

3 from the flywheel.
(4) Remove the driven plate from the flywheel.
3. Driven Plate Assembly (Except HEC Engine Series)
(1) Use the pilot aligner to prevent the driven plate assembly
from falling free.
Pilot aligner: 5-8525-3001-0 (J-24547)
(2) Mark the flywheel, clutch cover and pressure plate lug for
alignment when installing.
6VD14. Release Bearing (6VD1)
Remove the release bearing from the transmission case.

CLUTCH 7C-17
6VD15. Shift Fork (6VD1)
(1) Remove the snap pin.
(2) Remove the shift fork pin and shift fork from the fulcrum
bridge.
6VD17. Fulcrum Bridge (6VD1)
(1) Remove the fulcrum bridge bolts.
(2) Remove the fulcrum bridge from the transmission case.
Important Operations - Installation
Follow the removal procedure in reverse order to perform the
installation procedure.
Pay careful attention to the important points during the
installation procedure.
3. Driven plate Assembly (HEC Engine Series)
2. Clutch Pressure Plate Assembly (HEC Engine Series)
(1) Clean the flywheel surface.
(2) Clean the facing surface.
(3) Use the clutch pilot aligner

1 to install the driven plate
assembly

2 to the flywheel
3.
Clutch Pilot Aligner : 5-8840-2634-0
(4) Clean the pressure plate surfaces.
(5) Align the pressure plate assembly

4 with the flywheel
knock pin

5.
(6) Install the pressure plate assembly to the flywheel.
(7) Tighten the clutch cover bolts a little at a time in the
numerical order shown in the illustration.
Clutch Cover Bolt Torque N
m (kgfm/lbft)
17.6
4.9 (1.8 0.5/13.0 3.6)

7C-18 CLUTCH
8. Remove the clutch pilot aligner.
Note:
Do not strike the clutch pilot aligner with a hammer to
remove it.
6VD17. Fulcrum Bridge (6VD1)
(1) Install the fulcrum bridge to the transmission case.
(2) Tighten three fulcrum bridge bolts to the specified torque.
Fulcrum Bridge Bolt Torque N
m (kgm/lbft)
39 (3.9/28)
6VD15. Shift Fork (6VD1)
(1) Apply molybdenum disulfide contained type grease to the
pin hole inner circumferences and thrust surfaces.
(2) Attach the shift fork to the fulcrum bridge and insert the pin
from below of the fulcrum bridge.
(3) Install the washer and snap pin.
6VD14. Release Bearing (6VD1)
(1) Apply molybdenum disulfide contained type grease to the
areas shown in illustration.

CLUTCH 7C-19
6VD1(2) Install the release bearing in the proper direction.
3. Driven Plate Assembly (Except HEC Engine Series)
Use the pilot aligner to install the driven plate assembly.
Pilot aligner: 5-8525-3001-0 (J-24547)
6VD12. Pressure Plate Assembly (6VD1)
(1) Tighten the bolts holding the pressure plate assembly in the
order shown in illustration.
Pressure Plate Bolt Torque N
m (kgfm/lbft)
20.6
2.9 (2.10.3/15.22.2)
(2) Remove the aligner.
NOTE:
Do not strike the aligner with a hammer to remove it.
1. Transmission Assembly

7C-20 CLUTCH
INSPECTION AND REPAIR
Make the necessary adjustments, repairs, and part replacements if excessive wear or damage is discovered during
inspection.
PRESSURE PLATE ASSEMBLY
Visually inspect the pressure plate friction surface for
excessive wear and heat cracks.
If excessive wear or deep heat cracks are present, the
pressure plate must be replaced.
Pressure Plate Warpage
Use a straight edge and a feeler gauge to measure the
pressure plate friction surface flatness in four directions.
If any of the measured values exceed the specified limit, the
pressure plate must be replaced.
Pressure Plate Warpage mm(in)
Limit
0.3 (0.012)
Clutch Cover
Visually inspect the entire clutch cover for excessive wear,
cracking , and other damage.
The clutch cover must be replaced if any of these conditions
are present.
1. Abrasion, scratches, cracks and deflection of friction face to
the disc, loose rivet and wear of ring
Grind small scratches, or replace the assembly if extreme
scratches are found.

CLUTCH 7C-21
Clutch Set Force (Except 6VD1)
1. Position the pressure plate assembly
1 as shown in the
illustration.
2. Place the new driven plate

2 over the pressure plate
assembly.
Driven Plate Thickness (Reference) mm(in)
Standard
Free Compressed
HEC (MSG) 8.4 (0.330) 8.0 (0.315)
HEC (MUA) 8.6 (0.338) 8.0 (0.315)
4JG2T 8.2 (0.323) 8.0 (0.315)
4JA1 8.0 (0.315) 7.8 (0.307)
4JB1T 8.0 (0.315) 7.8 (0.307)
3. Place a metal sheet
3 between the press and the driving
plate.
4. Compress the metal sheet and the driven plate until the
driven plate is flush with the drive plate assembly

A.
5. Note the pressure gauge reading.
Driven Plate Slamping Force N (kg/Ib)
Standard
HEC (MSG), 4JA1 4,903 (500/1,103)
HEC (MUA), 4JB1T 5,492 (560/1,235)
4JG2T 6,276 (640/1,411)
Clutch Set Force (6VD1)
1. Invert the pressure plate assembly.
2. Place a new driven plate over the pressure plate.
A metal sheet with
A thickness of 8.0 mm (0.315 in) may
be used in place of the driven plate.
3. Compress the pressure plate assembly until the distance
B
becomes 12 mm (0.472 in).
4. Note the pressure gauge reading.
If the measured value is less than the specified limit, the
pressure plate assembly must be replaced.
Clutch Set Force N (kg/Ib)
Standard Limit
6VD1 7,208 (735/1,621) 6,669 (680/1,499)

7C-22 CLUTCH
Diaphragm Spring Finger Height
(Except 6VD1)
1. Place the appropriate spacer beneath the pressure plate.
Refer to the table below.
Spacer Thickness mm(in)
HEC, 4JG2T 8.0 (0.315)
4JA1, 4JB1T 7.8 (0.307)
2. Fully compress the pressure plate and the diaphragm
spring.
There are two ways to do this.
1) Use a bench press to press down the assembly from the
top.
2) Tighten the fixing bolts.
3. Measure the spring finger height

A from the base to the
spring tip.
Spring Finger Height mm(in)
HEC MSG 37-39
HEC MUA 39.9-41.9
4JA1 30.5-32.5 (1.20-1.28)
4JB1T 35.0-37.0 (1.38-1.46)
4JG2T 39.0-41.0 (1.53-1.61)
6VD1Diaphragm Spring Finger Height (6VD1)
1. Place a new driven plate or a 8.0 mm (0.315 in) spacer
beneath the pressure plate.
2. Fully compress the pressure plate and diaphragm spring.
There are two ways to do this.
1) Use a bench press to press down on the assembly from
the top.
2) Tighten the fixing bolts.
NOTE: (6VD1)
Pre-load on diaphragm spring finger must be 49 - 98N (5.0
- 10.0 kg / 11 - 22 lb) in direction of release, when clutch
cover assembly is bolted to the flywheel.
3. Measure the spring height from base to spring tip
A.
If the measured value exceeds the specified limit, the
pressure plate assembly must be replaced.
Spring Finger Height mm(in)
Standard
6VD1 49.9-51.9 (1.965-2.043)

CLUTCH 7C-23
Release Bearing Replacement
Removal (Except 6VD1)
Use the bearing puller and the adapter to remove the release
bearing.
Bearing Puller : 5-8840-0013-0 (J-22888)
Adapter : 5-8840-0124-0 (J-2241-11)
Release Bearing Installation (Except 6VD1)
1. Set the release bearing to the shift block bearing fitting
surfaces.
The release bearing must be perfectly horizontal.
2. Use a bench press to fit the release bearing to the shift
block.
Install the parts as illustrated after applying wheel bearing
grease or multi-purpose type grease (NLGI No.2 or No.3).
6VD1Release Bearing (6VD1)
1. Visually check the release bearing for excessive play, noise
and breakage.
If any of these conditions are discovered, the release
bearing must be replaced.
6VD1NOTE:
When replacing the release bearing, replace both the
wedge collar and wire ring at the same time.

7C-24 CLUTCH
Wedge Collar (6VD1)
1. Visually check the surfaces of the wedge collar making
contact with the release bearing for excessive wear and
damage.
2. Replace any exhibiting excessive wear damage.
Shift Fork (Except 6VD1)
1. Visually inspect the surfaces of the shift fork making contact
with the shift block for excessive wear and damage.
2. Remove any minor stepping or abrasion from the shift block
with an oil stone.
Replace any exhibiting excessive wear or damage.
3. Apply multi-purpose type grease (NLGI No.2 or No.3) to
area.
6VD1Shift Fork (6VD1)
1. Visually check the surfaces of the shift fork making contact
with the release bearing for excessive wear and damage.
2. Remove any minor stepping or abrasion from shift fork with
an oil stone.
Replace any exhibiting excessive wear of damage.
DRIVEN PLATE ASSEMBLY
1. Visually inspect the torsion spring
1 for looseness,
breakage, and weakening.
If any of these conditions are discovered, the driven plate
assembly must be replaced.
2. Visually inspect the facing surfaces
2 for cracking and
excessive scorching.
Visually inspect the facing surfaces for the presence of oil or
grease.
If any of these conditions are discovered, the facing must be
cleaned or replaced.

CLUTCH 7C-25
3. Check that the driven plate moves smoothly on the
transmission top gear shaft spline.
Minor ridges on the top gear shaft spline may be removed
with an oil stone.
Driven Plate Warpage
1. Insert the clutch pilot aligner into the driven plate splined
hub.
The clutch pilot aligner must be held perfectly horizontal.
Clutch Pilot Aligner : 5-8840-2634-0 (HEC Engine Series)
5-8525-3001-0 (J-24547) (Except HEC Engine Series)
2. Set a dial indicator to the driven plate outside
circumference.
3. Slowly turn the driven plate.
Read the dial indicator as you turn the driven plate.
If the measured value exceeds the specified limit, the driven
plate assembly and/or the facing must be replaced.
Driven Plate Warpage mm(in)
Standard Limit
0.7 (0.028) 1.0 (0.039)
Driven Plate Splined Hub Spline Wear
1. Clean the driven plate splined hub.
2. Install the driven plate to the transmission top gear shaft
spline.
3. Set a surface gauge to the driven plate outside
circumference.
4. Slowly turn the driven plate counterclockwise.
Measure the spline rotation play as you turn the driven
plate.
If the measured value exceeds the specified limit, the driven
plate assembly must be replaced.
Driven Plate Splined Hub Spline Wear mm(in)
Standard Limit
0.5 (0.020) 1.0 (0.039)